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US-20260128225-A1 - MULTILAYER CERAMIC CAPACITOR

US20260128225A1US 20260128225 A1US20260128225 A1US 20260128225A1US-20260128225-A1

Abstract

A multilayer ceramic capacitor includes a multilayer body including dielectric layers and inner electrode layers, first and second main surfaces facing each other in a lamination direction of the dielectric layers, first and second side surfaces facing each other in a width direction, and first and second end surfaces facing each other in a length direction, a first outer electrode on the first main surface and the first end surface of the multilayer body, and a second outer electrode on the first main surface and the second end surface of the multilayer body. The inner electrode layers are exposed from the first and second end surfaces, which are inclined so as to splay out from the first main surface toward the second main surface. Projecting portions including the dielectric layers and the inner electrode layers are located on the first and second end surfaces.

Inventors

  • Kosuke ONISHI

Assignees

  • MURATA MANUFACTURING CO., LTD.

Dates

Publication Date
20260507
Application Date
20251231
Priority Date
20230721

Claims (20)

  1. 1 . A multilayer ceramic capacitor comprising: a multilayer body including a plurality of dielectric layers, a plurality of inner electrode layers, a first main surface and a second main surface facing each other in a lamination direction, a first side surface and a second side surface facing each other in a width direction orthogonal to the lamination direction, and a first end surface and a second end surface facing each other in a length direction orthogonal to the lamination direction and the width direction; a first outer electrode on the first main surface and the first end surface of the multilayer body; and a second outer electrode on the first main surface and the second end surface of the multilayer body; wherein the inner electrode layers are exposed from the first end surface and the second end surface; the first end surface, from which the inner electrode layers are exposed, are inclined so as to splay out from the first main surface toward the second main surface; and first projecting portions including the dielectric layers and the inner electrode layers are provided on the first end surface.
  2. 2 . The multilayer ceramic capacitor according to claim 1 , further comprising: a third outer electrode on the first side surface of the multilayer body; and a fourth outer electrode on the second side surface of the multilayer body; wherein the inner electrode layers are exposed from the first side surface and the second side surface; the first side surface, from which the inner electrode layers are exposed, are inclined so as to splay out from the first main surface toward the second main surface; second projecting portions including the dielectric layers and the inner electrode layers are provided on the first side surface; and about 7/10≤L/W≤about 10/7 is satisfied, where L is a dimension in the length direction and W is a dimension in the width direction.
  3. 3 . The multilayer ceramic capacitor according to claim 1 , wherein at least two or more of the first projecting portions are provided on each of the first end surface.
  4. 4 . The multilayer ceramic capacitor according to claim 2 , wherein at least two or more of the second projecting portions are provided on each of the first side surface.
  5. 5 . The multilayer ceramic capacitor according to claim 1 , wherein in the width direction, in any one of the first projecting portions: an angle T 1 P 1 P 2 ≥an angle T 1 P 2 P 1 is satisfied; where a vertex T 1 of the first projecting portion is a portion with a greatest thickness in a direction perpendicular to the end surface; P 1 is an end point of the first projecting portion on the first main surface side; and P 2 is an end point of the first projecting portion on the second main surface side.
  6. 6 . The multilayer ceramic capacitor according to claim 2 , wherein in the length direction, in any one of the second projecting portions: an angle T 2 P 3 P 4 ≥an angle T 2 P 4 P 3 is satisfied; where a vertex T 2 of the second projecting portion is a portion with a greatest thickness in a direction perpendicular to the side surface; P 3 is an end point of the second projecting portion on the first main surface side; and P 4 is an end point of the second projecting portion on the second main surface side.
  7. 7 . The multilayer ceramic capacitor according to claim 5 , wherein each of the angle T 1 P 1 P 2 and the angle T 1 P 2 P 1 is about 15° to about 75°, inclusive.
  8. 8 . The multilayer ceramic capacitor according to claim 6 , wherein each of the angle T 2 P 3 P 4 and the angle T 2 P 4 P 3 is about 15° to about 75°, inclusive.
  9. 9 . The multilayer ceramic capacitor according to claim 1 , wherein a thickness of any one of the first projecting portions is about 0.3 μm to about 3.0 μm, inclusive, in a direction perpendicular to the first end surface.
  10. 10 . The multilayer ceramic capacitor according to claim 2 , wherein a thickness of any one of the second projecting portions is about 0.3 μm to about 3.0 μm, inclusive, in a direction perpendicular to the first side surface.
  11. 11 . The multilayer ceramic capacitor according to claim 1 , wherein an area of the first main surface is less than an area of the second main surface.
  12. 12 . The multilayer ceramic capacitor according to claim 2 , wherein an area of the first main surface is less than an area of the second main surface.
  13. 13 . The multilayer ceramic capacitor according to claim 1 , wherein about 5°≤θ 1 ≤about 50°, where θ 1 is an angle between the first end surface and a perpendicular line drawn to an extension of a side of the first main surface at an intersection of the first main surface and the first end surface of the multilayer body.
  14. 14 . The multilayer ceramic capacitor according to claim 1 , wherein about 5°≤θ 3 ≤about 50°, where θ 3 is an angle between the first side surface and a perpendicular line drawn to an extension of a side of the first main surface at an intersection of the first main surface and the first side surface of the multilayer body.
  15. 15 . The multilayer ceramic capacitor according to claim 4 , wherein in the length direction, in any one of the second projecting portions: an angle T 2 P 3 P 4 ≥an angle T 2 P 4 P 3 is satisfied; where a vertex T 2 of the second projecting portion is a portion with a greatest thickness in a direction perpendicular to the side surface; P 3 is an end point of the second projecting portion on the first main surface side; and P 4 is an end point of the second projecting portion on the second main surface side.
  16. 16 . The multilayer ceramic capacitor according to claim 4 , wherein a thickness of any one of the second projecting portions is about 0.3 μm to about 3.0 μm, inclusive, in a direction perpendicular to the first side surface.
  17. 17 . The multilayer ceramic capacitor according to claim 4 , wherein an area of the first main surface is less than an area of the second main surface.
  18. 18 . The multilayer ceramic capacitor according to claim 12 , wherein in the length direction, in any one of the second projecting portions: an angle T 2 P 3 P 4 ≥an angle T 2 P 4 P 3 is satisfied; where a vertex T 2 of the second projecting portion is a portion with a greatest thickness in a direction perpendicular to the side surface; P 3 is an end point of the second projecting portion on the first main surface side; and P 4 is an end point of the second projecting portion on the second main surface side.
  19. 19 . The multilayer ceramic capacitor according to claim 12 , wherein a thickness of any one of the second projecting portions is about 0.3 μm to about 3.0 μm, inclusive, in a direction perpendicular to the first side surface.
  20. 20 . The multilayer ceramic capacitor according to claim 1 , wherein a width dimension of the multilayer ceramic capacitor is larger than a length dimension of the multilayer ceramic capacitor.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application claims the benefit of priority to Japanese Patent Application No. 2023-119007 filed on Jul. 21, 2023 and is a Continuation Application of PCT Application No. PCT/JP2024/013804 filed on Apr. 3, 2024. The entire contents of each application are hereby incorporated herein by reference. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to multilayer ceramic capacitors. 2. Description of the Related Art Electronic devices such as a mobile phone and a portable music player have recently become increasingly smaller and thinner. Accordingly, multilayer ceramic electronic components such as a multilayer ceramic capacitor installed in such a smaller and thinner electronic device have also become smaller and thinner. Particularly, multilayer ceramic electronic components that are becoming thinner are increasingly being used, for example, embedded in a wiring board, or being mounted in a very narrow space even when mounted on the surface of the wiring board. As such, the thinner the multilayer ceramic electronic components, the lower the mechanical strength thereof, leading to a strong demand for securing the mechanical strength. For example, Japanese Unexamined Patent Application Publication No. 2012-4180 discloses a multilayer ceramic capacitor that has been made thinner. As a method for forming outer electrodes in the multilayer ceramic capacitor described in Japanese Unexamined Patent Application Publication No. 2012-4180, a conductive paste is applied by screen printing onto a ceramic mother block before division into chips for outer electrodes located on both main surfaces of a ceramic body (multilayer body), while the conductive paste is applied by immersing the end surfaces of the ceramic body in the conductive paste for outer electrodes located on both end surfaces of the ceramic body. SUMMARY OF THE INVENTION In this case, the areas of inner electrode layers and ceramic layers exposed at both end surfaces of the multilayer body of the multilayer ceramic electronic component are small, which causes a problem in fixing strength between the outer electrodes and the multilayer body. Example embodiments of the present invention provide multilayer ceramic capacitors each capable of improving fixing strength between a multilayer body and outer electrodes. A multilayer ceramic capacitor according to an example embodiment of the present invention includes a multilayer body including a plurality of laminated dielectric layers, a plurality of inner electrode layers laminated on the dielectric layers, a first main surface and a second main surface facing each other in a lamination direction of the plurality of dielectric layers, a first side surface and a second side surface facing each other in a width direction orthogonal to the lamination direction, and a first end surface and a second end surface facing each other in a length direction orthogonal to the lamination direction and the width direction, a first outer electrode located on the first main surface and the first end surface of the multilayer body, and a second outer electrode located on the first main surface and the second end surface of the multilayer body, the inner electrode layers are exposed from the first end surface and the second end surface, the first end surface and the second end surface, from which the inner electrode layers are exposed, are inclined so as to splay out from the first main surface toward the second main surface, and first projecting portions including the dielectric layers and the inner electrode layers are provided on the first end surface and the second end surface. In a multilayer ceramic capacitor according to an example embodiment of the present invention, the inner electrode layers are exposed from each of the first end surface and the second end surface. The first end surface and the second end surface from which the inner electrode layers are exposed are inclined so as to splay out from the first main surface toward the second main surface, and the first projecting portions including the dielectric layers and the inner electrode layers are provided on the first end surface and the second end surface. As the surface area of a metal component and a dielectric component in the first projecting portion increases, at least the contact area between a metal component in the outer electrode and a metal component in the multilayer body increases. As a result, the fixing strength between the multilayer body and the outer electrodes is improved. Example embodiments of the present invention provide multilayer ceramic capacitors each capable of improving fixing strength between the multilayer body and the outer electrodes. The above and other elements, features, steps, characteristics and advantages of the present invention will become more apparent from the following detailed description of the example embodiments with reference to the attached d